package com.lagou.utils;

import com.alibaba.druid.pool.DruidDataSourceFactory;

import javax.sql.DataSource;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;

public class DruidUtils {
    public static DataSource dataSource;

    static {
        // 创建属性集对象
        Properties p = new Properties();

        // Druid 连接池不能主动加载配置文件，需要指定文件
        InputStream resourceAsStream = DruidUtils.class.getClassLoader().getResourceAsStream("druid.properties");

        try {
            // Properties对象的Load方法 从字节流中读取配置信息
            p.load(resourceAsStream);

            // 通过工厂类获取连接池对象
            dataSource = DruidDataSourceFactory.createDataSource(p);

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    // 获取连接
    public static Connection getConnection() {
        try {
            return dataSource.getConnection();
        } catch (SQLException e) {
            e.printStackTrace();
            return null;
        }
    }

    // 获取数据库连接池对象的方法
    public static DataSource getDataSource() {
        return dataSource;
    }

    // 释放资源
    public static void close(Connection con, Statement statement) {
        if (null != con && null != statement) {
            try {
                statement.close();
                // 归还连接
                con.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

    public static void close(Connection con, Statement statement, ResultSet resultSet) {
        if (null != con && null != statement) {
            try {
                resultSet.close();
                statement.close();
                con.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}
